"What I have found will either save or destroy you. This sanctuary, this unbroken circle, has effectively concealed its power for ? how long? Perhaps hundreds of thousands of years. Whoever made such a place must now live in chains; there is no other explanation for their absence.

This enemy - YOUR enemy - has proven more irritating than I anticipated. They own nothing which they have not stolen. I can barely make sense of their incessant rhetoric, except to know that you seem to be their Devil."

So all the Covenant's technology is stolen from Forerunners ? (Including these symbols or the entire language)